Migrate boxWithJava tests to multi-file framework

compiler/testData/codegen/boxWithJava/collections/platformValueContains.kt

@@ -0,0 +1,52 @@
+// FILE: J.java
+
+import java.util.*;
+
+public class J {
+    public static String nullValue() {
+        return null;
+    }
+}
+
+// FILE: test.kt
+
+class MySet : Set<String> {
+    override val size: Int
+        get() = throw UnsupportedOperationException()
+
+    override fun isEmpty(): Boolean {
+        throw UnsupportedOperationException()
+    }
+
+    override fun contains(o: String): Boolean {
+        throw UnsupportedOperationException()
+    }
+
+    override fun iterator(): Iterator<String> {
+        throw UnsupportedOperationException()
+    }
+
+    override fun containsAll(c: Collection<String>): Boolean {
+        throw UnsupportedOperationException()
+    }
+}
+
+fun box(): String {
+    val mySet = MySet()
+
+    // no UnsupportedOperationException thrown
+    mySet.contains(J.nullValue())
+    J.nullValue() in mySet
+
+    val set: Set<String> = mySet
+    set.contains(J.nullValue())
+    J.nullValue() in set
+
+    val anySet: Set<Any?> = mySet as Set<Any?>
+    anySet.contains(J.nullValue())
+    anySet.contains(null)
+    J.nullValue() in anySet
+    null in anySet
+
+    return "OK"
+}